The death of NASCAR driver Jason Leffler at a dirt-track race near Philadelphia earlier this week has brought more attention to small, local tracks, where some big names like Stewart still show up to race on occasion. Keselowski made it clear he didn't know the specifics about what happened to Leffler, but he says safety standards are "a hundred times worse at the local level."

A medical examiner's report says Leffler died of a "blunt force neck injury" in Wednesday's accident at Bridgeport Speedway in Swedesboro, N.J.